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Comparison of Graphene Oxide and Reduced Graphene Oxide for DNA Adsorption and Sensing

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Comparing Graphene Oxide and Reduced Graphene Oxide for DNA Adsorption and Sensing-s.pdf (1.35 MB)

Date

2016-10-18

Authors

Lu, Chang
Huang, Po-Jung Jimmy
Liu, Biwu
Ying, Yibin
Liu, Juewen

Journal Title

Journal ISSN

Volume Title

Publisher

American Chemical Society

Abstract

Fluorescently labeled DNA adsorbed on graphene oxide (GO) is a well-established sensing platform for detecting a diverse range of analytes. GO is a loosely defined material and its oxygen content may vary depending on the condition of preparation. Sometimes, a further reduction step is intentionally performed to decrease the oxygen content, and the resulting material is called reduced GO (rGO). In this study, DNA adsorption and desorption from GO and rGO is systematically compared. Under the same salt concentration, DNA adsorbs slightly faster with a 2.6-fold higher capacity on rGO. At the same time, DNA adsorbed on rGO is more resistant to desorption induced by temperature, pH, urea, and organic solvents. Various lengths and sequences of DNA probes have been tested. When its complementary DNA is added as a model target analyte, the rGO sample has a higher signal-to-background and signal-to-noise ratio, whereas the GO sample has a slightly higher absolute signal increase and faster signaling kinetics. DNAs adsorbed on GO or rGO are still susceptible to nonspecific, displacement by other DNA and proteins. Overall, although rGO adsorbs DNA more tightly, it allows efficient DNA sensing with an extremely low background fluorescence signal.

Description

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, © 2016 American Chemical Society after peer review and technical editing by publisher. To access the final edited and published work see Lu, C., Huang, P.-J. J., Liu, B., Ying, Y., & Liu, J. (2016). Comparison of Graphene Oxide and Reduced Graphene Oxide for DNA Adsorption and Sensing. Langmuir, 32(41), 10776–10783. https://doi.org/10.1021/acs.langmuir.6b03032

Keywords

Single-Stranded-DNA, Platform, Fluorescence, Surface, Biosensor, Assay, Nanoparticles, Spectroscopy, Desorption, Graphite

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Citation

URI

http://dx.doi.org/10.1021/acs.langmuir.6b03032
 http://hdl.handle.net/10012/11809

Collections

Waterloo Research
Chemistry
Waterloo Institute for Nanotechnology